[Retros] 4 related pj's

[Joost de Heer]

> L2 -> L3 in 20,5

> 

> 1. Nc3 d5 2. Nxd5 Be6 3. Nf4 Qd4 4. a3! Ba2 5. b3! Qb2 6. c3! h5 7. Qc2 Rh6

> 8. Qh7 Ra6 9. d3! Nc6 10. Be3 Rd8 11. Bb6 Nd4 12. e3! Ne2 13. f3! Rd4

> 14. Kf2 Nc1+ 15. Kg3 Re4 16. Kh4 g5+ 17. Kxg5 Bg7 18. g3! Bd4 19. Bh3 Nf6

> 20. Bc8 e6 21. h3!


Only other proofgame with this theme I know is R137 - Satoshi Hashimoto, Probleemblad May/June 2001 (22.0 moves)


> L2 -> L4 in 17,5

> 

> 1. h4! d5 2. Rh2 Bh3 3. g4! Qd6 4. Rg2 Qh2 5. f4! Nf6 6. Kf2 Ne4+ 7. Kf3 Nf2

> 8. e4! d4 9. Bc4 d3 10. Qe2 dxe2 11. d4! e5 12. Bd2 Ba3 13. Ba5 0-0

> 14. Bxf7 Kh8 15. c4! e1R 16. Nc3 Rb1 17. b4! Bc1 18. a4!


http://janko.at/Retros/Schwalbe/N165.htm, #9651 shows this in 15.5 moves.


> L7 -> L6 in 18

> 

> 1. d3 a6! 2. Be3 Ra7 3. Bxa7 b6! 4. h4 Bb7 5. Rh3 Bxg2 6. e4 c6! 7. Qh5 Qc7

> 8. Nf3 Qh2 9. Ne5 d6! 10. Nd7 e6! 11. Qe5 f6! 12. Be2 Kf7 13. Bg4 Kg6

> 14. Bf5+ Kh5 15. Nc3 g6! 16. 0-0-0 Bh6+ 17. Kb1 Bc1 18. Rd2 h6!


Only other example I know is R126 - Joost de Heer, Probleemblad Mar/Apr 2001 (19.0 moves)


> L7 -> L5 in 17

> 

> 1. d4 h5! 2. Bh6 g5! 3. Qd3 Bg7 4. Qh7 f5! 5. Nf3 Nf6 6. Ne5 Rg8 7. Ng4 e5!

> 8. Nc3 Qe7 9. Nd5 Qa3 10. Ne7 d5! 11. c4 Bd7 12. c5 Ba4 13. c6 Nd7

> 14. cxd7+ Kf7 15. d8B c5! 16. Ba5 b5! 17. Bc3 a5!


Right now I can't think of any other example.

Joost
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